|
GB2116723A
|
|
Electromagnetic detection fo underground objects
|
|
GB2075199A
|
|
Detection system for concealed current carrying conductors
|
|
US4427942A
|
|
Concealed electrical conductor detecting system
|
|
US4220913A
|
|
Apparatus for and methods of electromagnetic surveying of elongated underground conductors
|
|
GB1577742A
|
|
Apparatus for and methods of electromagnetic surveying
|
|
GB1545889A
|
|
Electromagnetic location systems
|
|
DE2554039A1
|
|
ANTENNA SYSTEM
|
|
US4006445A
|
|
Apparatus for and methods of seismic prospecting
|
|
GB1509380A
|
|
Underground metal pipe or cable location
|
|
GB1509914A
|
|
Detector systems for electromagnetic surveying
|
|
GB1438864A
|
|
Surveying apparatus
|
|
GB1412399A
|
|
Apparatus for and methods of seismic prospecting
|
|
GB1340198A
|
|
Electromagnetic surveying instruments
|
|
GB1299183A
|
|
Improvements relating to surveying instruments
|
|
GB1299182A
|
|
Improvements relating to plotting apparatus for use in conjunction with surveying instruments
|
